001/* 
002    Licensed to the Apache Software Foundation (ASF) under one
003    or more contributor license agreements.  See the NOTICE file
004    distributed with this work for additional information
005    regarding copyright ownership.  The ASF licenses this file
006    to you under the Apache License, Version 2.0 (the
007    "License"); you may not use this file except in compliance
008    with the License.  You may obtain a copy of the License at
009
010       http://www.apache.org/licenses/LICENSE-2.0
011
012    Unless required by applicable law or agreed to in writing,
013    software distributed under the License is distributed on an
014    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015    KIND, either express or implied.  See the License for the
016    specific language governing permissions and limitations
017    under the License.  
018 */
019package org.apache.wiki.tags;
020
021import org.apache.log4j.Logger;
022import org.apache.wiki.api.core.Engine;
023import org.apache.wiki.api.core.Page;
024import org.apache.wiki.api.exceptions.ProviderException;
025import org.apache.wiki.pages.PageManager;
026
027import java.io.IOException;
028
029/**
030 *  Returns the currently requested page or attachment size.
031 *
032 *  @since 2.0
033 */
034public class PageSizeTag extends WikiTagBase {
035
036    private static final long serialVersionUID = 0L;
037    private static final Logger log = Logger.getLogger( PageSizeTag.class );
038    
039    @Override
040    public final int doWikiStartTag() throws IOException {
041        final Engine engine = m_wikiContext.getEngine();
042        final Page page = m_wikiContext.getPage();
043
044        try {
045            if( page != null ) {
046                long size = page.getSize();
047
048                if( size == -1 && engine.getManager( PageManager.class ).wikiPageExists( page ) ) { // should never happen with attachments
049                    size = engine.getManager( PageManager.class ).getPureText( page.getName(), page.getVersion() ).length();
050                    page.setSize( size );
051                }
052
053                pageContext.getOut().write( Long.toString(size) );
054            }
055        } catch( final ProviderException e ) {
056            log.warn("Providers did not work: ",e);
057            pageContext.getOut().write("Error determining page size: "+e.getMessage());
058        }
059
060        return SKIP_BODY;
061    }
062
063}